# Load Flow Studies · Power System Analysis · GATE EE

Start Practice## Marks 1

GATE EE 2018

A 1000 $$ \times $$ 1000 bus admittance matrix for an electric power system has 8000 non-zero
elements. The minimum number of branches (transmission l...

GATE EE 2017 Set 1

A $$3$$-bus power system is shown in the figure below, where the diagonal elements of $$Y$$-bus matrix are: $${Y_{11}} = - j12\,pu,\,\,\,{Y_{22}} = ...

GATE EE 2017 Set 1

A 10-bus power system consists of four generator buses indexed as G1, G2, G3, G4 and six load buses indexed as L1, L2, L3, L4, L5, L6. The generator b...

GATE EE 2017 Set 2

The figure show the per-phase representation of a phase-shifting transformer connected between buses $$1$$ and $$2,$$ where $$\alpha $$ is a complex n...

GATE EE 2017 Set 2

In a load flow problem solved by Newton-Raphson method with polar coordinates, the size of the Jacobian is $$\,100\,\, \times \,\,100.$$ If there are ...

GATE EE 2016 Set 1

The magnitude of three-phase fault currents at buses A and B of a power system are 10 pu and 8 pu, respectively. Neglect all resistances in the system...

GATE EE 2016 Set 1

In a 100 bus power system, there are 10 generators. In a particular iteration of Newton Raphson load flow technique (in polar coordinates), two of the...

GATE EE 2015 Set 2

A $$3$$-bus power system network consists of $$3$$ transmission lines. The bus admittance matrix of the uncompensated system is
$$\left[ {\matrix{
...

GATE EE 2014 Set 3

A 183-bus power system has 150PQ buses and 32 PV buses. In the general case, to obtain the load flow solution using Newton-Raphson method in polar coo...

GATE EE 2012

The bus admittance matrix of a three-bus three-line system is
$$y = j\left[ {\matrix{
{ - 13} & {10} & 5 \cr
{10} & { - 18} & ...

GATE EE 2003

A power system consists of $$300$$ buses out of which $$20$$ buses are generator buses, $$25$$ buses are the ones with reactive power support and $$15...

GATE EE 1996

If the reference bus is changed in two load flow runs with same system data and power obtained for reference bus taken as specified P and Q in the lat...

GATE EE 1995

In load-flow analysis, a voltage-controlled bus is treated as a load bus in subsequent iteration for a _________limit is violated.

GATE EE 1993

In load flow analysis, the load connected at a bus is represented as

GATE EE 1992

In load flow studies of a power system, the quantities specified at a voltage-controlled bus are ____________and___________

## Marks 2

GATE EE 2018

The per-unit power output of a salient-pole generator which is connected to an infinite bus,
is given by the expression, P = 1.4 sin $$\delta $$ + 0.1...

GATE EE 2017 Set 1

The bus admittance matrix for a power system network is
$$$\left[ {\matrix{
{ - j39.9} & {j20} & {j20} \cr
{j20} & { - j39.9} &...

GATE EE 2015 Set 1

Determine the correctness or otherwise of the following Assertion (a) and the Reason (R).
Assertion (A): Fast decoupled load flow method gives approx...

GATE EE 2013

In the following network, the voltage magnitudes at all buses are equal to $$1$$ p.u., the voltage phase angles are very small, and the line resistanc...

GATE EE 2013

For a power system network with $$n$$ nodes, $${Z_{33}}$$ of its bus impedance matrix is $$j0.5$$ per unit. The voltage at mode $$3$$ is $$1.3\angle ...

GATE EE 2013

In the following network, the voltage magnitudes at all buses are equal to $$1$$ p.u., the voltage phase angles are very small, and the line resistanc...

GATE EE 2011

A three–bus network is shown in the figure below indicating the p.u. impedances of each element
The bus admittance matrix, $$Y$$-$$bus,$$ of the net...

GATE EE 2009

For the $${Y_{bus}}$$ matrix of a $$4$$-bus system given in per unit, the buses having shunt elements are
$$${Y_{BUS}} = j\left[ {\matrix{
{ - 5} &...

GATE EE 2006

The Gauss Seidel load flow method has following disadvantages. Tick the incorrect student.

GATE EE 2006

For a power system the admittance and impedance matrices for the fault studies are as follows.
$$$\eqalign{
& {Y_{bus}} = \left[ {\matrix{
{ ...

GATE EE 2006

For a power system the admittance and impedance matrices for the fault studies are as follows.
$$$\eqalign{
& {Y_{bus}} = \left[ {\matrix{
{ ...

GATE EE 2005

The network shown in the given figure has impedances in p.u. as indicated. The diagonal element $$Y22$$ of the bus admittance matrix $${Y_{BUS}}$$ of ...

GATE EE 2003

The bus impedance matrix of a $$4$$-bus power system is given by
$$${Z_{bus}} = \left[ {\matrix{
{j0.3435} & {j0.2860} & {j0.2723} & {j...

GATE EE 2002

A power system consists of 2 areas (Area 1 and Area 2) connected by a single tie line (figure). It is required to carry out a load flow study on this ...

## Marks 5

GATE EE 2002

Two transposed $$3$$ phase lines run parallel to each other. The equation describing the voltage drop in both lines is given below.
Compute the sel...

GATE EE 2001

For the $$Y$$-$$bus$$ matrix given in per unit values, where the first, second, third and fourth row refers to bus $$1, 2, 3$$ and $$4$$ respectively,...